design of books XML/JSON/YAML notation based on [Associative Array] style approach

structure of page example:
```
#???
##???
### API Design
#### Проектирование архитектуры API
##### ???
```

entities and attributes:
```
book(s)
- title
- subtitle
- publisher
-- store link
- year
```
```
author(s)
- name
- github link

```
```
image(s)
- src="URI" a
- alt="" 
- width="120"
```